Host a is transferring a file of size s to host b using tcp. a sends the file data in fixed size packets equal to the maximum segment size (mss), a predetermined value. b sends an acknowledgement immediately upon receiving a data segment. let r be the round trip delay between a and b. the advertised receiver window size of host b is w . in this problem, we assume the tcp connection is already established and that the transmission time is negligable. tcp performs the slow start and congestion avoidance mechanisms, and there is no error or packet loss during transmission.